Malicious PDF — malware analysis report

Static analysis result for SHA-256 143af4a8cef278ce…

MALICIOUS

PDF

75.5 KB Created: 2021-03-08 23:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bb324292f0b0799bb7386e08d3d8da7f SHA-1: 63d056bc617b5fa09aa645777f009699d15c3cad SHA-256: 143af4a8cef278ce6863ddb8aa483c45075755b5cc368408abeab4c8d6740285
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a primary heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Fragen mit pr positionen pdf', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/award?keyword=fragen+mit+pr%25C3%25A4positionen+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392237/normal_5ff86a4c39b16.pdfIn PDF document text
    • http://ledy66.net/97038303362otpw6.pdfIn PDF document text
    • http://esmoney.site/how_to_evaluate_cultural_competencer3w91.pdfIn PDF document text
    • http://moviesaddaa.online/how_to_color_the_periodic_tableud3wu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446165/normal_6030532986173.pdfIn PDF document text
    • http://vekovemomotewo.22web.org/mtd_snowblower_electric_start_cord.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449968/normal_5fea2da008ea5.pdfIn PDF document text
    • http://flowerport.shop/jackie_robinson_justice_at_last_story8cya3.pdfIn PDF document text
    • http://24goodstore.site/poema_en_lengua_nahuatl_y_su_traduccion0xez9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/watch_online_movies._com._pk_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b318a42b-5f85-436c-a1fa-2091cde88b28/58320917100.pdfIn PDF document text
    • http://venukugikek.rf.gd/folilinusodenuburikozekej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4901f3e-c0fe-4d79-8b1f-b2007be01f97/hp_g42_motherboard_price_in_india.pdfIn PDF document text
    • http://zesubilav.epizy.com/highest_paid_aircraft_mechanics.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/lojejozuzumodol.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/fowejiwabolakilakaxazuma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122ed659-2232-43e2-903b-6e0ae2c59364/sazogujelipe.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/nafadowege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec2f494-a946-4350-ae0a-f5b635ede50c/bakodisoj.pdfIn PDF document text
    • http://jopumogezev.epizy.com/95418697561.pdfIn PDF document text
    • http://xetulugesoboko.epizy.com/rowififezigokof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a87a16-5a4b-4d87-be41-16571ca33a49/mob_grinder_schematic_minecraft.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 5520 bytes
SHA-256: 9ce70111841fa1f4c82bebcca0d5da96debddf27af17f735cd1a2ce80654e42c
font_01_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 11448 bytes
SHA-256: 5ec7213c450490f1e6a0268379b575fe6e16c60d18d911cc2b2783504e7205e9

Open this report in the interactive analyzer, or submit your own file for analysis.